Control for a microphone



Dec. 13, 1927.

;A. 1.. BOWER CONTROL FOR A MICROPHONE Filed June 21, 1926 l/IVENTQR latented Dec. 13, 1927.

UNITED STATES].

ABRAM L. BOWER, OF SOUDER TON, PENNSYLVANIA.

CONTROL FOR A MICROPHONE.

Application filed June 21,

. The purpose of this invention is to control therelation of the microphone to the broadcaster from a more or less remote point, preferably from the vicinity of a loud speak or, The inventor has observed that the manager of a broadcast studio made frequent trips from the studio to the side of a large loud speaker and returned to prompt the broadcaster in case his relation to the face 1 of the microphone was not quite right.

The drawing illustrates one embodiment of the invention. In the drawing F represents the frame or front of the microphone and I do not propose to move this by remote I control. F may be a plain ring of sufficient size to keep the attention of the broadcaster. Mi is the microphone proper. It is supported on the top of a vertical shaft or axis S but it may be supported on a horizontal shaft instead. Shaft S also carries an insulated contact arm. 35 which rides over a number of brass contact plates 34, 32, 30, 28, 26, 2A, 22, 20, 18 when the microphone Mi is rotated so that its plane forms a more 25 or less acute angle with theplane of frame F. Shaft S carries a gear G near its lower end and this gear G engages aworm gear W operated horizontally by a shaft connected to a reversible motor Mo. The microphone is connected .by wires 40 and 41 with an amplifying set RS contain ing the usual batteries and equipment. The

output of the amplifying set RS is con-- nected to the loud speaker L S by wires 42 and 43. This loud speaker is placed at any desired point, preferably in a room adjoining the studio.

The motor M0 is controlled by a key or switch K and a pole changer 7 and is energized by a battery 1 or other generator of electric current. This wiring maybe sim plified by making the field magnet Fi of the motor a permanent magnet and providing for the reversal of. the current direction through the armature Ar of the motor Mo.

. The circuit to the armature is as fol lows :--from battery 1, to wire 2, key K, c0ntact 3, contact 4, wire 5, armature Ar and wire 6 to the battery. The circuit to the field Fi is as follows :-from the battery 1, to wire 2, key K, contact 3, contact 4, wire 5,

arm 12, contact 11, wire 10, field Fi, wire 9,

contact 8, arm 7 and wire 6 to the battery. By throwing the pole changer to its lower 1926. Serial No. 117,631.

position the motor will be reversed .because the current supply in the field winding F i will be reversed.

The gear reduction between the worm WV and gear G should be considerable. The drawing does not show the full gear reduction desired. 3

In starting the broadcasting, the microphone may be turned to the position shown. In case the microphone suffers a jar from the voice of the broadcaster, key K is pressed causing the motor to deflect the microphone plane still further. When the result is pleas-. mg, the key is released.

However if the result is weak and greater volume is desired the amplification may be increased or the pole changer may be reversed and the key again be pressed down until the force-of the broadcasters voice is right. The key is then raised. It is understood that the key may be provided with a spring to open the circuit to the motor when the pressure is removed from the key.

An ammeter or other current'gauge A M is placed near key K and the loud speaker L S. Reslstances 33, 31 etc., are connected to ad aCent brass plates 33, 31, 29 etc. The circuit of the gauge is as follows,from the battery 16, to brass contact 18, resistance 19, contact 20, resistance 21, contact 22, resistance 23, contact 24:, resistance 25, contact 26, resistance 27, contact 28, resistance 29, contact 30, arm 35, wire 36, gauge Am, and wire 37 to the battery 16. The reading of the gauge is in degrees to correspond with the angle to which the microphone is turned. Various modifications of this invention may be made without departing from the spirit and scope thereof.

I claim 1. The combination of a microphone with a remote. control and means for varying the relation of said microphone-to thebroadcaster, said remote control controlling said means.

2. A microphone mounted on a shaft and adapted to be moved thereby, a motor to operate the shaft and an electric circuit including the motor.

In witness whereof, I have signed this ipegification this nineteenth day of June,

ABRAM L. BOWER. 

